Tag: human lymphatic system

The palate is the roof the mouth in humans and other mammals. It separates the oral cavity from the nasal cavity. A similar structure is found in crocodilians, but, in most other tetrapods, the oral and nasal cavities are not truly separate. The palate is divided into two parts, the anterior bony hard palate, and the posterior fleshy soft palate (or velum). The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continuously, and most of the time, involuntarily. The trachea, colloquially called windpipe, is a tube that connects the pharynx and larynx to the lungs, allowing the passage of air. Thus, option B is correct.

Respiratory membrane must be semi- permeable in nature to allow the passage of small molecules and ions. It should also support the process of diffusion. Only large molecules are transported using channels or porins. In root, the ascent of sap takes place through simple diffusion. If cell membrane was not semi permeable then it could have never happen. If it was permeable or impermeable then it is difficult for cell to survive. Thus, option C is correct.

Air enters the body through the nose and mouth. After the nose and mouth air goes through the pharynx or throat. After the pharynx, air goes into the larynx or voice box. 

Respiratory membrane must be semi- permeable in nature to allow the passage of small molecules and ions. It should also support the process of diffusion. only large molecules are transported using channels or porins. In root, the ascent of sap takes place through simple diffusion. If cell membrane was not semi permeable then it could have never happen. If, it was permeable or impermeable then it is difficult for cell to survive. 

Smoking is a practice in which a substance is burned and the smoke is breathed in and absorbed into the bloodstream. Most commonly used substance is the dried leaves of the tobacco plant. Smoking is primarily practised for recreational drug use.
 The combustion of the dried plant leaves vaporizes and delivers active substances into the lungs where they are rapidly absorbed into the bloodstream and reach bodily tissue. 
Smoking generally has negative health effects, because smoke inhalation may cause effects on physiologic processes such as respiration.
Hence, the smoke inhaled by the respiratory system.
So, the correct option is ' the respiratory system'.

Puncturing the thoracic wall (pneumothorax) disrupts the negative intrapleural pressure required to keep the lungs inflated against their natural elastic recoil, leading to lung collapse and respiratory failure.

Actually, only about 350 mL of air (out of total 500 mL tidal volume) enters the lung alveoli for the exchange of gases. The remaining 150 mL fills the respiratory passage and is termed as dead air space because no exchange of gases takes place here.

Liver is the largest organ in the body. It helps in digestion and removes waste products and worn-out cells from the blood. Liver performs many functions, like it forms and secretes bile that contains bile acids to aid in the intestinal absorption of fats and the fat-soluble vitamins as A, D, E, K and $B _{12}$. Hence, it stores vitamins as A, D, E, K and $B _{12}$.

• The oral and nasal cavities lie near the body midline, inferior and medial to the orbital cavities, anterior to the pharynx and medial to the infratemporal fossa.
• They are separated from one another by the palate. 
• Each cavity has an entrance and an exit. Hence, Nasal chambers and buccal cavity are separated by the palate.